Ebay. I used an upgrade for mine and just bought another one for $380 on ebay.
There are several people in my area, Glendale, AZ, that are selling the TB for $300-$375. I am going to meet a guy at the VZW store today and if the ESN# checks out then I will be the owner of a TB. I currently have the DX, just always like to try out the latest stuff and my next upgrade is not until July and I am hoping that the Bionic/Targa/D3 will be out by then.
I got mine using an early upgrade on my primary line. It did come out to $380 but I didn't mind paying a little extra to get it on release date. My Droid 1 (after 1.5 years) was slowly dying, and did die about a month after I got the Thunderbolt.
I wasn't do till November and I got mine I would always walk in there and ask if I could upgrade they would always shot me down had the D1, do u have the Verizon app that checks ur min,data etc. There I clicked where it says device once that opens click ur first option which is upgrade device if ur lucky like me it will say good news ur on ur way to an upgrade,so I walked in there and this time I told him didn't ask and showed him that they couldn't say no, my advice is check in that app or also log in to ur Verizon wireless acc and check through there as well.
I had a Droid X and wanted to try out 4G and sense UI. So I sold my X on eBay and upgraded using the money
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I had a Droid Inc that met a horrid end so insurance sent me a DroidX to replace it, went on craigslist and traded it even for a Thunderbolt. I didn't like the locked bootloader on the X and I hate moto blur so all I was looking for was something other than a Moto and got lucky.