Bias Tape is NOT hard to make and you don’t need to purchase anything – you will need
2 Straight Pins
1 Piece of fabric cut 1″ x 3″ approx – Holding Strip
The strip you will make into bias tape, I cut mine large to show, normal cut will be 3/4″ to 1 1/4″ wide.
Iron over your edges, 1/8″ to 1/4″ and Press
Do both sides/edges
Lay your started binding down, press side up.Take your Holding Strip and lay on top, Pin into your ironing board cover next to the bias tape.
Pull the bias tape
And, with a hot, dry iron press, at first do a bit, and lift iron, pull and iron.
As the tape becomes longer you can leave the iron and pull slowly.
(Other side view)
Pull tape slowly
Good side of bias tape. 
I like to roll mine to keep it until I’m ready to use it.I learned this years ago from a Home Eco. teacher in the 70’s
No need to buy a machine to do this for you ! But, you can if you like !
