I live in Louisiana and often buy bikes in Mississippi. When I do buy in Mississippi; the dealer is required to fill out the dreaded "Orange Paper" and send it to Louisiana.
Then it is up to you to carry the papers down to the DMV and apply for a title and registration. They are nice enough to collect the tax $$ at that point.
However, if you do not volunteer to pay your taxes and fees, the State will send a nasty note, charge you some stiff penalties, and flag your drivers license. :whiner:
Texas? I don't know.
Best Suzuki dealer (that I know about) in Mississippi is Hattiesburg Cycle. Hattiesburg, Miss. Ask for Glen.