I do not recommend using wax on a maple fretboard, and I'd consider yourself lucky the Dingotone is out of stock...
You can get Tru Oil from a gun shop if you want a Tru Oil finish, but there are more options than just DT & TO. Those just happen to be the two products PBG normally stock.
The most popular DIY products besides Tru Oil, are polyurethane and lacquer. Polyurethane can be purchased as a wipe-on product or in spray cans as well as in a satin or gloss finish and can be water based or oil based. Lacquer, both acrylic or nitrocellulose can be purchased in spray cans but tends to be more expensive (especially nitro). This is presuming you don't have a compressor and spray gun to mix and spray a solvent based finish.
Oil based poly can be diluted with mineral turps to make it a consistency which can be wiped on and is significantly cheaper than store-bought "wipe-on poly".
There are other products, but I have just hit the top of the list for you.
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