OP, you are probably aware of this work, but I'll post anyway.

I think it's important not to skimp on resveratrol as MANY products in the supplement world are garbage and not manufactured correctly.

Look up the work of Bill Sardi. He has done extensive work with resveratrol.

Read these two pages first:
[link to longevinex.com (secure)]
[link to longevinex.com (secure)]

Then explore the rest of the site along with his resveratrol research site: [link to www.resveratrolnews.com (secure)]

I know this does not fall in line with the lower cost options you were trying to provide, but it's important since many resveratrol supplements are likely rancid or of poor quality to not be effective.