Brand new they run @ $1,600. I bought mine used with all sorts of wonderful attachments for $225.
eBay has a lot of Rainbows available.
I have an attachment for cleaning hardwood, tile, or vinyl floors that is incredible. Poor water and cleaner on the floor and with one side of the attachment you "brush" the floor to clean it and then flip over the attachment and suck everything up. Never mop again. Plus it has a mini head for cleaning stairs and furniture. I love it. I will have a Rainbow for as long as I am the one vacuuming.
It sounds like you could get very hungry while vacuuming.
Low Oil