For the cost of a couple of net tanks and a bit of scrounging and labor you can build your own hooka rig.
First, get one of those portable air compressors for painting. You want an oilless compressor and an output of 2 cfm at 125 psi. Be sure that it has a tank as a surge tank is required.
Next, get a scuba second stage and a long hose.
You can use PVC hose as long as it doesn't get too hot. If the hose will never be used at a temperature over 90 degrees F PVC is ok. Better hose is food grade hose similar to what you see in the back of a soda fountain. Use a hose longer than the depth you want to go by an amount that will give you the needed horizontal range.
Now, setup a weight belt to make yourself just neutral at the depth you will be enjoying most.
On this weight belt add a D ring.
Take a double ended snap and attach the second stage hose to the weight belt. This way if you drop the reg out of your mouth you can find it again easily.
Now you have a system that works where there is electricity. What about out in the sticks?
Buy a small generator, be sure it is big enough to start the compressor. The starting current on these things can be 2 to 3 times the rated running current. Take along an extension cord so the generator can be a good distance downwind of the compressor.
I can buy everything in this system new for less than $1000. With a little shopping I can often get the total down to something like $500 or less.
As a plus you now also have a generator and a usefull (just) air compressor.
The people building these things for sale have to charge more to cover insurance and the added cost of making it fancy and pretty enough for people to buy.
michael