Have one you'd like to sell ?
Send me a PM.
Thanks, cruise4two48
In addition to what Bob has suggested you should look into MPB and Robert's Camera. Both will give you a 6 months warranty and they both are reputable dealers.
B&H, Adorama are also very reputable dealers but I am not familiar with their warranty on used lenses.
If you want to reply, then
register here. Registration is free and your account is created instantly, so you can post right away.