I don't want to buy the tree, stick it in the ground and it never bears fruit.

Please let me know as I'd like to go back tonight to get the tree if possible. Thanks.

"Typically" apricots are self-fruitful while plums often require pollinators. However, both Sunset and and Ortho book on fruit trees lists damson plums as self-fertile.

So.....

Seems like an odd combo, the growth habits of the two being so different.

Might settle for the goldkist apricot and santa rose plum both of which have low chill requirements, any thoughts on this combo?

Don't get me wrong . . when I used the term Frankenfuit - I was just funning with you.
Combined grafts can be either great or not so great depending entirely on the varieties put together. The combination you mentioned just seemed odd because traditionally the two trees would grow a bit differently, and they have different tolerances and sensitivities to certain pests and diseases in our local growing environment.

Here are some observations to consider:
The Blenheim apricot pictured earlier is only in it's second fruiting season, and is already 16'tall regardless of prunings for bearing strength and shape. It produced a crop of 2 dozen fruit the first season, and over 350 this season. On the other hand, the nectaplum, peaches, and plumbs planted at the same time are all about 20-30% smaller trees. They also maintain their blooms longer, are slower to mature their fruit, and have smaller fruit loads than the apricot. They look quite different too. The apricot seems immune to nearly everything that the plumbs and peaches have suffered from - like powdery mildew. This long cool spring/summer has been challenging for them. The Blenheim couldn't care less.

If you love the idea of a combo fruit, I say go for it, and keep in mind there are good and bad combinations for many reasons besides the examples of growth habit, fruit weight, and pest/disease resistance given.

You might also consider combining in a different way.
For instance, if an apple or guava variety requires a pollinating mate, but space is limited, you can place the two trees in the same planting hole to grow together. This scheme works well with other species too. I have cherries growing this way, and the combination is compact, beautiful, and easy to maintain. Some species do not like combined rooting though, so you will need to keep this in mind.

I hope this adds a few more ideas to your toolkit.

Sounds like apricots produce a lot of fruit, which would be great.

I'm thinking I might have to work on my soil a bit first before planting more fruit trees, I have really clayish soil and I just bought a bunch of compost from this place

http://www.serranocreeksoils.com/

hoping that it will do something, but will probalby take several months at least. Trying to figure out how to get earthworms to multiply, i'm sure that would help a lot!

http://heritagemuseumoc.org/the-kellogg-family/

Another few spots worth stopping if close:

Orange County Farm Supply for broad selection of more exotic compost and other items not usually stocked elsewhere - fun to see anyway.
H&H Nursery up in Lakewood. They have a great selection of fruit trees, and many other things at great prices. While everyone else is stocking only dwarf citrus these days, H&H has many standards and simi dwarfs also. I found a beautiful Macadamia nut tree there, sourced from LaVerne - a local grower with excellent stock. Every Laverne
variety I have ever planted has been vigorous and productive.
http://www.lavernenursery.com/

Best,