I stumbled upon a sale at Ikelite and thought I'd pass it on. There are 46 items including housings, trays, filters, etc. with better-than-list prices:
That link has been used for a few price reductions since at least this past summer. If you are an Ikelite user it might be worth bookmarking.
Sorry if this violates any sales rules; delete if necessary. I am not affiliated with Ikelite in any way other than being a customer.