I was surfing eBay for the umpteenth time today and saw three very good deals on refill cards, as well as an eBay store that I had seen awhile back and found really nice...
Net10 $300 card for $219 (making for about 7.3 cents a minute and $18.25 a month for 250 minutes a month)
Boost Mobile refill cards for 80 cents on the dollar ($16 for $20, $24 for $30, $40 for $50)
$250 in Free2Go refill cards for $110
This last item is great because not only can you get TDMA service for 11 cents a minute, but you may also get approached by Cingular (through a text message) asking you to switch over to their new GoPhone GSM service. You'll probably have to buy a phone and aritime, but you can get those for just $30 online. Once you get them, you can just take your whole $250 over to GoPhone and have normally-priced (vs. the ripoff Cingular usually is on GoPhone) minutes, text messaging, email and web (0.44 cents per kilobyte isn't that bad if you're using Cingular's higher-speed EDGE network).
And now for the store: Project Recell
These guys buy people's old phones from them, then sell them on eBay at low starting prices. For example, an unlocked, like-new Nokia 3595 GSM phone startes at $10 I think and has a Buy It Now option for $35 plus shipping, a price that can be found practically nowhere else on eBay for some odd reason...
They have an abundance of Verizon, AT&T TDMA, and GSM phones, so if you want to get a phone for, for example, PagePlus or Beyond Wireless, this is probably the place to go. I thought a little bit about bidding on several Kyocera Phantoms (KX414 I think), activating them on PagePlus, then selling them on eBay as PagePlus has a dearth of modern phones for sale.
Hope these deals help someone :)