A rebuilt head is around 300 bucks if your trade in isn't cracked and a head gasket set about 80 dollars. You MIGHT be able to find wrecked car with a good head, but don't count on that.

Spend the money and have a friend come over and help you when you have a weekend off and you should be able to fix the honda. Take photographs at every stage to see where all the hoses and crap go. It's isn't that hard at all really, but you need a good torque wrench and be sure to clean the head bolt holes in the block really good with a tap and USE NEW HEAD BOLTS.Don't try to cut corners by leaving out this 40 dollar expense. It sounds to me like even if your car isn't worth a lot on blue book, it is still worth fixing to you. Be sure to flush that gunk you put in it out of it, it works for a short time at best and clogs everything up and restricts coolant flow. Repairs like this can hold against the pressure of the coolant easily, but your leak is between the combustion chamber and the coolant passages and no bs repair can hold against the pressure of the combustion chamber for very long.