So far, the only supplement I have subbed has been the Omega 3. I did a little bit of research and wanted something very similar to the values of the IP brand but cost effective. I ended up going to Costco and buying the Kirkland Super Concentrate Omega 3 (300 softgel/bottle). Each softgel contains 420mg EPA & 280mg DHA. I take 3 gels a day. Kirkland uses Meg-3 brand fish oil concentrate so it's been ultra-purified.
Kirkland Omega 3