Do like " FreeSampleOffer.com " although it's ultimate - best use - may take a bit of imagination or creativity.
Could a so named site offer a myriad of monetized / sponsored links to companies offering
" free samples " ?
Could one company or product line similarly use the domain to promote their product/s ?
While I like the name am reluctant to venture forth an educated estimated value - if mine would likely not consider less than a lowish xxxx offer.
FreeTrialKit.com too is a nice name although prefer and believe the former has a wider use in the consumer marketplace.