hendb, you should try bark grafting. We have excellent pictorial demos here.
You can then order budwoods from CCPP. There are many members in California who can also spare you a budstick of many citrus cultivars as long as your county allows movement of citruses inside it. For rootstocks, you can simply grab citripots (4" x 4" x 18") from Home Depot that sells for just $11, then you can graft unto these.