Your welcome Snippy. The most expensive re-ennactment gear for Civil War is portraying Cavalry and artillery. A good mount that isn't gun shy and is trained in Cavalry manouvers dosen't come cheap and is expensive to maintain properly. Some artillery outfits are called 'Flying Guns'. They have four mules or more to pull the cannon and limber to different positions on the battlefield at a moments notice. Two men ride the limber. One drives and the other hangs on. The rest are also mounted. Very expensive but if you love mules thats what you do. The uniforms, clothing and gear for infantry can be accumulated for around $1,500.00. It's a good idea to buy the best you can when you can and follow the advice of more seasoned re-ennactors in making selections for your impression. Nothing is more derided or looked down upon than the 'farb'.
I suppose Revolutionary outfitting would be more expensive but I haven't done any of that. I'd like to but here in Missouri it was coonskin hats and buckskins for britches in the 18th century.
You might find that an occassional weekend volunteering at some historic site is really fun and relaxing. You'll meet some very fine people and learn too. If you like it then it might be a good idea to get in touch with a seamstress who makes period clothing with the appropriate fabrics, dyes and buttons. There are many such artisans around who produce both civilian and military goods. One such is a business in Virginia called Blockade Runner. They are on the web. The one her close to me is called James Country, also on line. Take a look.