I've been offered 3 2nd hand fuzzis for £6 each but they don't have inserts so that would mean another £2.50 which makes them £8.50 when they are £11.50 brand new with the insert! not sure what to do! Obviously it does still save me money though!
I have done in the early days of trying fuzzis but as mediums last most kids til potty training I thought it was much better to have the use of nice new ones then sell them for £6 when I've finished!!! As you know you like them I'd buy new. If it were a test one then probably worth it though.
You also dont' need to have the proper inserts, I use my homemade hemp (long folded in half to make 4 layers like the ellas house hemp ones) and a mf cloth. The booster cost me about a pound and the cloth about 30 pence, so half the price of the fuzzi insert.