The problem with revolver kits is that they are usually kits in name only, requiring little more than final assembly to complete. Thus, the high prices of the kits. Alot of manufacturers don't even bother with offering a kit form of their revolvers for this reason, as the price differance between a revolver kit, and a finished pistol, is negligable.
There are a few, a few mind you, low price revolvers out there, namely from Pietta, Pietta offers an 1858 New Army 44 Remington revolver with a brass frame, trigger gaurd and backstrap for on or about 200 from Dixie. I beleive also, this particular gun is available as a kit for around 180, but marketed under a different name for some reason. Both are available from Dixie.
As far as a smaller caliber pistol is concerned, I believe the 1858 is available in a 36 caliber as well. Going down even smaller, to the 31 caliber, 5 shot pocket pistols, those gemerally are offered starting at about 200 for a finished gun. But at 200, be prepared to take it apart and re-work it a bit, especially the Pietta 1863 Remington 31 cal 5 shot. Those guns, stock from the factory have hammer locking problems, nipple seating problems, and a problem with the loading levers as well. They are fixable problems, but somewhat annoying.
The possibles shop, offers alot of pistol kits, especially unusual ones, such as a 4 shot 36 cal pepperbox, and a number of other smaller, affordable single shot or multi barrel gun kits. But be forewarned, nearly all of those kits are out of production at this time, and delivery is spotty at best. I have seen some of these kits being offered on Guns America, and Ebay, and ususally at about 1/2 the list price as well.
The Possibles Shop Pistol Kit Page,
http://possibleshop.com/pistol-kit.html
Dixie Gun Works Pistol Kit Page,
http://www.dixiegunworks.com/default.php?cPath=22_162_194
Dixie Gun Works Flintlock Pistol Kit Page,
http://www.dixiegunworks.com/default.php?cPath=22_162_195
1863 Remington 31 Cal Pocket Pistol by Pietta, available from Dixie for $199.00. Not a kit, but does need some TLC and finshing out of the box.
Classic Arms 4 barrel 36 Cal Pepperbox kit, which is now out of manufacture, but still listed in the Dixie catalog at around $140.00 or so. These kits are frequently offered for sale on Ebay and Guns America for about 1/2 of the list price.
Sincerely,
ElvinWarrior... aka.. David, "EW"