If you do not care about the egiptian look, then 250 dollars can easily make you a rather size able army(easy 2000+ points).
This is how you go about it:
2 pacs os 60 mantic skeletons 120 dollars
1 GW plastic 2 wizard human kit 25 dollars
2 Resin Sfinxs (courtesy of our chinesse friends) 36 dollars
Ruleswise you would go with:
1 wizards a lvl 4 with 4+ ward save and 10sw swords (your hierofant)
1 lvl 2 naked to help cast your movement spell, may be with scroll or stone.
2-3 princes, mostly naked just for the ws for the blocks.
3 blocks of 40 full command, i would use at least 1 with spears and shields and light armor to benefit from the hierofants regen. or you could split it 2 of 40 and 2 of 20, this is likelly more usefull and you could do with 1 less prince.
2 Sfinxes, to do the heavy lifting killing (i fancy the warsfinx better than the fliying one).
At this point you are rapidly approaching the 2000 points
Spare parts from the 120 skellies can make you with some ingenuity, some 20 archers (i do really fancy these ones). Some Swarm or Carrion flyer the name scapes me.
At this point you are already over 2000k and at 181 dollars. You can sprinkle extra candy to your liking.