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If you have time, list the best ones on eBay a few at a time. If you list them all as one lot, or list too many at once, you probably won't do very well with them.
Museums generally are not interested in old vacuum cleaners.
If you are just looking to get rid of them, you can always give them away to other collectors. The down-side of that is that it can become a HUGE hassle, with some people pestering you to death and others accusing you of playing favorites. There most likely will be a lot of hard feelings when it's all said and done.
And unless you have a number of collectors nearby, you'll have deal with the tremendous amount of work involved in packing and shipping them (and making sure the recipients pay for the shipping charge before you send them out).
There really is no easy way to do it, sorry to say.