Four peptide vendors were running buy-one-get-one-free (BOGO) offers when we checked on October 21, 2026: Zeptix Labs, Elite Peptides, RUO Science and Blue Sky Peptide. Counting the free vial, the cheapest BPC-157 was Zeptix Labs at about $1.50 per mg, against a median of $5.45 per mg across the 71 vendors in our BPC-157 price index. Only Zeptix names the labs behind its COAs.
Notice: Research peptides are sold for in-vitro laboratory research only. They are not FDA-approved, not for human or animal consumption, and this page is not medical advice. Deals change often: confirm the offer at checkout.
BOGO deals at a glance (checked October 21, 2026)
| Vendor | What the BOGO covers | How it applies | End date | COAs |
|---|
| Zeptix Labs | 7 products: retatrutide (GLP-3 R), tirzepatide (GLP-2 T), tesamorelin, BPC-157, MOTS-c, GHK-Cu, KLOW, in the sizes marked BOGO | "Applied automatically at the cart"; both vials the same product and size | None given ("a limited offer") | Yes: Freedom Diagnostics, Accumark, Ichor |
| Elite Peptides | About 20 listings titled "Buy 1 Get 1 Free" (BPC-157, PT-141, tesamorelin, CJC/ipamorelin blends, TB-500, epitalon and more); Follistatin and IGF-1 excluded | Not stated on the homepage | None given | Not mentioned on the homepage |
| RUO Science | Banner: "Buy 1, Get 1 Free on every product, no limit" | Not stated on the homepage | None given | Says COAs are in a COA library; no lab named |
| Blue Sky Peptide | 3 products labeled "Buy 1 Get 1 Free": TB-500 2 mg, ipamorelin 2 mg, fragment 176-191 2 mg (plus a 35% off sitewide promotion) | Not stated on the homepage | None given | Says a COA is provided for every product |
We've now reviewed all four: Zeptix Labs, Elite Peptides, RUO Science and Blue Sky Peptide. Only Zeptix names its testing labs, and Blue Sky also sells prescription drugs and SARMs, which is why it doesn't appear in our deals lists.
Real cost per mg after the free vial
The headline price buys two vials. Here's the cost per mg once the second vial is counted, next to the median in our price index for the same compound.
| Compound | Vendor | Listed price, vial size | Cost per mg with BOGO | Price-index median |
|---|
| BPC-157 | Zeptix Labs | $29.99, 10 mg | $1.50 | $5.45 |
| BPC-157 | RUO Science | $69.00, 10 mg | $3.45 | $5.45 |
| BPC-157 | Elite Peptides | $39.99, 5 mg | $4.00 | $5.45 |
| Tesamorelin | Zeptix Labs | $49.99, 10 mg | $2.50 | $7.30 |
| Tesamorelin | Elite Peptides | $34.99, 2 mg | $8.75 | $7.30 |
| Retatrutide | Zeptix Labs | $44.99, 10 mg | $2.25 | $5.97 |
| Tirzepatide | Zeptix Labs | $39.99, 10 mg | $2.00 | $5.20 |
| MOTS-c | Zeptix Labs | $29.99, 10 mg | $1.50 | $4.50 |
| PT-141 | Elite Peptides | $49.99, 10 mg | $2.50 | $4.50 |
| TB-500 | Blue Sky Peptide | $23.37, 2 mg | $5.84 | $7.00 |
| Ipamorelin | Blue Sky Peptide | $27.27, 2 mg | $6.82 | $6.21 |
Prices are the vendors' listed prices on October 21, 2026, before shipping. Medians come from our weekly price index. Note the Elite Peptides tesamorelin and Blue Sky ipamorelin deals: even with a free vial, they cost more per mg than the typical regular price.
How to judge a BOGO deal
- Do the per-mg math. Divide the price by twice the vial size. Small vials at high prices often stay expensive.
- Check the lot. Both vials normally come from one lot, so one COA should cover both. Ask for it before you order.
- Look at shipping thresholds. Zeptix charges a flat $12, free from $200 after discounts; Elite Peptides ships free over $149.
- Read the fine print. Size restrictions ("sizes marked BOGO"), exclusions (Elite excludes Follistatin and IGF-1) and stacking rules with first-order codes vary.
- Weigh the vendor, not just the deal. Our vendor directory and best peptide vendors in the USA rank on testing and transparency.
More discounts: peptide deals this week tracks sales and price drops across every vendor in our price index, and peptide coupon codes lists verified codes.
Checked October 21, 2026 from each vendor's own site. We re-check this page weekly; tell us about a BOGO we missed via our contact page.
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