Lots of people make their own sharpening jigs, and it's a pretty straight forward job if you're used to working with steel.
The Wolverine by oneway is the jig I use myself, and it's an excellent piece of kit. The Storme is obviously a copy of this and other similar systems, but is great value for money and will last a lifetime.
After you've bought steel and spent a day or so making the jig you could probably have saved money by buying one from Axminster. At least you know they've got all the angles and settings correct, and you can use it right out of the box.
There are turners who insist you MUST learn to freehand grind, but my own view is that sharp tools are sharp tools no matter how you achieve the degree of sharpness. Properly sharpened tools will mean safer, cleaner cuts, shapes that you intend rather than have them dictated by dull tools, and will make your time at the lathe all the more enjoyable. So whichever option you decide upon, grind sharp, turn safe, and enjoy it.
And remember....a dull tool is often forced and this can lead to not only torn grain but dig-ins and potentially dangerous mishaps at the lathe.