It gets very expensive very quickly I should know this trip offshore has cost me near on 600 on detailing bits and pieces but bought a few new mitts and towels etc so not all consumables.
My biggest piece of advice would be ask someone in the know before you spend your money cause its so easy to end up with stuff you wont need or never use, I know I have lots of stuff I rarely use and it just sits there. On the other hand I also have products I couldn't be without and use them all the time.