I trained in LVL and I charge £50 for a treatment including a colour boost.
No way in hell am I going to charge £25 for this treatment. Even if I used a different system, I wouldn't charge as little as that. I book an hour out for a treatment and by the time you take the product cost off, it wouldn't be worth my while doing it.
If you have a lash perming qualification then most companies will let you buy their lash lifting kits.
You cannot do LVL treatments unless you have done the LVL course. Also, if you do the LVL course then you still will not be insured to do lash perming, you would need to do a separate course.
I took lash perming off my treatment menu ages ago as hardly anyone wanted them.