I want to send money to my friend in HDSP but I want it to get there as quickly as possible. Does anyone know if they allow any type of wire transfers? Or is it strictly money orders through the mail?

No money wires that I know of. Fastest way would be express mail, but you may be able to use priority mail for the same timeframe. Express mail is overnight, priority mail is usually 2-3 days. However the prison doesn't take delivery on Sat or Sun. So if you are mailing on a Friday, might as well use priority mail for under $4 instead of express mail for $16.

As far as I know nothing but money orders either are allowed

Ok Thanks for the information

only money orders are accepted. Just a reminder. Money orders can not be sent directly to the inmate. They need to be made out to the inmate, include the CDC number, and sent to the inmate money processing PO BOX.
Last I checked the address was:
PO BOX 270249
SUSANVILLE, CA 96127