The Masque slot collections do all the IGT, Bally and other US Slots very well. Try a search for Masque and slot and you will find many of their collections. They are typically sold in the $10 bin in stores that sell inexpensive games once the collection has been out for a while.
I am not familiar with fruit machine emulators but I know they exist. Again google is probably your friend to locate them.
Of course there are some older slots and I think some fruit machines in Mame.