The great advantage here is that the maximum number of employees will get tax receipts for their donations (in most countries you only geta tax receipt if you donate to the local chapter of your country) plus the local chapter is much better equipped to provide follow-up services to the donor.
You can plug in the actual cost for an item, if you have areceipt (or can geta copy of one from the previous owner), or pick among price ranges the software generates based on national market surveys.
But Harare's money-changers will happily give 70 or 80, unless you ask for areceipt, while industrialists looking for foreign exchange must part with anything up to 100 Zim dollars to get hold of a single greenback.