Question about AirCards

[2Xtreme21]

I found a few cards on ebay that are of the brand "Sierra," yet they don't state whether I'm able to configure a Verizon VZAccess plan (or maybe it's just a Verizon Wireless Broadband plan... not sure) with it or not. If that were possible it would save us a considerable amount of money as these generic phone cards cost a lot less than if we were to buy straight from the vendor.

Anyone work with this before or have any ideas?