Are we talking $200CAD or USD? USD would give you a little bit more wiggle room.
I’ve been using the boss welder with a graphene lipo for maybe 3 years now and it’s still running great. The total of everything was probably more like $200USD.
I think the only other option to do it for even cheaper would be to really go DIY with it. I liked the ease of use of the boss welder. Worth the money imo.