IMHO spending $200 to fix a $100 dulcimer is not worth it unless you happened to luck onto an historical instrument from a known master builder (it has happened, but rarely). Spend the $200 on another instrument. Keep you eyes open here for someone selling an instrument that you could become attached to, at a price you can afford!
As Richard sez, we can talk you through cleaning up the instrument you have, adjusting the tuners so they work as properly as possible, and other issues.
As a new player I recommend you copy, print and read the following booklet I wrote a few years back for beginners called
I Just Got A Dulcimer, Now What? It's an illustrated glossary of dulcimer terms, so we all speak the same jargon, plus answers to many beginner questions about tuning, playing, care and feeding. Tips like how to never breaks another string when tuning...
Ken Hulme's "I Just Got A Dulcimer, Now What?" Article - Strumelia | fotmd.com
The Beginner Players Group here is the perfect place to ask beginner questions. You actually have to Join the Group to read most posts and make your own posts there. Start a new post with your question(s) rather than tagging in on someone else's post -- it will help others like you find the answers you asked for.