Tamron 90mm is a very gd lens, i just sold mine last week due to under-utilizing.. If not can sell you.. Anyway wish u all the best in getting one in B&S.. Last 2 weeks still got ppl selling in B&S, but this week seems like no more liao..
Using the Tamron SP90mm Di f2.8 myself....never regrette buying. Good, sharp macro lens.
No worry bout the slow focusing, using manual focus for all my macro shots. No wory bout the f2.8, not using f2.8 for any macro shots......normally used f16 n above for macro..