Bay Area colocation has been expensive since they started billing based on power, rather than physical space. I had a good thing going in the 90s to ~2005ish with a long term contract I signed giving me a full cabinet on a 100mbit unmetered line for ~$600/mo. When that contract expired it promptly jumped to ~$1500/mo.
I know that's not much space compared to the big boys, but it fit our needs at the time pretty well.
If you're looking for colocation stuff these days, and you're not huge and need to be in San Jose, I'd look at some of the spaces in Sacramento.
Other great spots around the country: Dallas, Chicago, Atlanta, and in Virginia around MAE-East.
I know that's not much space compared to the big boys, but it fit our needs at the time pretty well.
If you're looking for colocation stuff these days, and you're not huge and need to be in San Jose, I'd look at some of the spaces in Sacramento.
Other great spots around the country: Dallas, Chicago, Atlanta, and in Virginia around MAE-East.