That is definitely becoming an issue. All these little supply items sure add up fast. I might have saved $300 by recovering the fan and cover from the old camper, but it cost me almost $100 in supplies and over $50 for the cheapie I filled the hole on the old camper with. Ive got the one I took off yesterday on Marketplace for $50 and have a $30 offer. I countered and hope we can settle on $40.
So far, selling off the original batteries and excess train supplies has fully funded the LiFePo4 battery bank that is yet to be fully installed.