I have ordered 3 times from EliteResearchUSA and it's now in my top 2 sources for peptides, aminos, and ancillaries.
Shipping and Packaging: Shipping is done promptly from their Texas location and I typically receive my order on the West Coast within 3 days. The packaging is quality with sturdy custom boxes and sealable sleeves for vials. Orders come with a sticker and orders over $500 come with a free ER hat.
Assortment: ER has the standard peptides you'd expect, but they also offer an assortment of unique blends and aminos that you will not find elsewhere. This is where I spend my money with ER. (see below)
Pricing: ER's pricing for single vial peptides is a little higher than the bulk pricing I pay through my other favorite vendor, but there are some great pricing in other areas. There is an active group of affiliates on X (Twitter) with promo codes that offer 10% off. In addition, you can get another 5-15% off by ordering between 3-10+ items and the discount scales with item count.
I've made purchases of 3-5 items, but now I bundle up my purchases to hit the 10 item count for max discount and the free hat if I spend $500.
Quality: Multiple COAs from different testing sources are posted. They use BioRegen and Freedom. My experience with their products have been excellent.
My personal research: I have purchased and researched the following:
SLU-PP-332 250mcg pills: My wife and mom are running these and I recently starting taking them to extend my endurance in the gym and can vouch they are legit. I have previously taken SLU-PP-332 via a compounding pharmacy, and I feel like ER's product is on par (or better).
HCG: After my TRT clinic wanted to charge me $900 for 10,000 IU of HCG, I went looking for other options! ER offers 5000 IU of HCG for $45 and my balls can vouch for the efficacy. I have stocked up on this.
Tadalafil: I take 5mg daily for endothelial benefits, the gym pumps, and the way it makes my veins pop. There is also a nice side benefit. I have a prescription for 2.5mg of the brand name stuff buy this from ER to allow me to take the desired 5mg daily and I notice no difference. The price is excellent. I have stocked up on this too.
Thermogenix: This is one of their amino blends which includes 5-amino 1MQ, L-Carnitine, L-Arginine, Albuteral, L-Ornithine, and ATP. I research 25 units of already reconstituted blend IM immediately before my rat hits the gym and it's a heckuva energy boost.
Good luck with your own research!