PLEASE, PLEASE, PLEASE...
get a webcertificate...
webcertificate.com I think it is, it's MasterCard-associated...
put about $35 dollars on it and use it down to less than $7-8 bucks that way even if the companies try to charge you they can't...
get free samples or whatever and cancel if you can, but if they give you too much trouble on the phone or something goes wrong, at least they can't charge you $40 to your regular credit or debit card...
I ran into a little trouble with TrimLife cause I thought I had 2 weeks after I got the sample, not 2 weeks after ordering the sample... (so I lost like $8 of shipping charge, either way I came out way ahead, but it was still an inconvenience...)
Go ahead and do the deals, just make sure you get yourself a webcertificate...
make and account and just send it to yourself, I used my yahoo e-mail to create a WebCertificate account (to be able to buy and send) and then sent one to that e-mail address (so my account acts a both a purhaser and receiver)...
you'll be out on 3-4 bucks of fee, but it's worth it so it acts as insurance...
also, try not to give your phone number, try to look for a disconnected one, but don't use one that exists for someone...
MANY TIMES they'll try to not give you credit for doing it, and it can get messy to finally get credit, but as long as you persist with the claim form you fill online and e-mails, eventually they should give you the credit (by foward confirmation e-mails from sponsers)...
I hope they've already sent my NES-edition SP, I'm awaiting it...