To get a good, sturdy tripod for $100, even without a head, you will have to go used. Something like an old Manfrotto 190 or 055 with a three-way head are nearly indestructible and lots of people find them too heavy, so prices are low. You will have to look up the Bogen model numbers yourself as your importer didn't use the original model numbers.
A gimbal head is wonderful for a long lens, but very clumsy and can even get in the shot at the wide end of a super compact like the P1000 if you use a plate to get it to balance at the tele end.
Besides that, this is a discussion forum. We are not your personal shoppers!