Are there any universal camera housings?

Yes, there are. There are multiple brands that offer universal camera housings, from compacts to even DSLRs.

The more well known ones are Ewa Marine, who produce high quality soft waterproof bags for various camera sizes, and EasyDive who produce universal electronic dSLR housings. We do not carry those brands unfortunately.

Another well-known brand for universal video (camcorder) housings is Mangrove. Browse their housings here.

There are also universal smartphone housings, which are very convenient for people who just want to take photos underwater without having to invest in an additional camera. The quality may not be the same as using proper cameras but the ease of use and affordable housing options makes this option worthwhile.

You can find smartphone housings here.