I've had a friend or two saying they've had some issues with ComicLink mostly in the customer-service realm, not the books themselves. I think they're great! The seller pays 10% so that's part of the final purchase price...plus I've been able to get many books for about 2/3 the ask price (say $100 for a book asking $150) (but that has its own risks too, have put in 75% bids hoping for a deal only to check back a little later seeing someone paid the full ask price that I would have been happy to pay...)...
So all you pay is $14 for standard shipping and that's up to 3 books! I always try to buy in batches of 2 or 3 which saves up to $28 in shipping...and it's been my experience that if you communicate well, they'll always work with you say if you say you're bidding on others and want to pay for them all 2 weeks down the road...
Good luck!