Early this year I replaced my Slik SL-76 Prototype taht I've been using since the mid 1980's (it was secondhand then), the new one one was less than 20 at a camear fair. OK that was pure luck but there's plenty of excellent second hand tripods in the UK for not much more. I used the old Slick with 5x4 and also 10x8 and before that professionally and it.

I've a Manfroto and a Majestic tripod as well and didn't pay much for either of them, so shop around, I see a lot of good tripods selling very regulary and in excellent condition.