I havn't personally tried it, but first aid tape may work better than duct tape. The wide sports tape, I see it at Dollar Tree. Might be more flexible.
You're right, fifty bucks is a bit pricey, for a hose that will probably crack in a few years. Fortunately, most household vac are only used briefly, and then back in the closet. Not like Miss Manners will stop by the house, and ask to view your vacuum cleaner for national survey.
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I was baffled by why the flexible bit does separate from the two end-pieces. Turns out that although the assembly is available all over the place for a high price, the hose itself has a part number (5230830) and is "only" $50.
I think I will try the duct tape method firstly and then see if it becomes available for any less than that before the tape starts attracting more dirt than the unit picks up! The problem is that holes have started to appear in it BECAUSE the plastic has probably hardened a bit and I would imagine more holes will start to appear in short order.