The Pit Stop on highway 95 sells water, propane and you can dump all for a fee. Same at the Rose RV park on Kuhen last year.
BLM lands camping areas come in two varieties - short term, free for up to two weeks, and long term, $40 for 2 weeks or $180 for the entire season. Long term gives you access to garbage stations, one dump station with two dumps and water fill up station near the dump. Busy in mid-Janaury to get to those services, can be a lengthy wait.
Quartzsite is a unique experience and can be great fun. Come ready to see lots of interesting things you never knew you needed and tons of other RVers. After the Big Tent RV/outdoor event it is kind of like someone pulled the plug - town empties quickly!