Help me get new wheelchair wheels

My name is Admir Skenderi, I'm 23 years old student from Montenegro. I use wheelchair since 2013 because I have Spinal Muscular Atrophy (SMA). Because of this disease, my muscles are getting weaker and for the last couple of months, it's getting kind of harder for me to push the chair. The reason I don't use electric wheelchair is because I can still use my arms to push the chair and because my doctors told me to use my arms as long as possible to preserve the strength.
The wheels I want to buy are electric (E-Motion M25) and they would help me maintain my active lifestyle without needing help from other people.
I like to go out a lot, and I'm also part of the Association for Disabled Persons in my town.
The money from this campaign will cover the wheels themselves, as well as the trip to Poland where I'm gonna buy the wheels (the wheels need to be set up before using them and Poland is the closest country where they're available).
My friend in USA helped me to set this up because this site is not available in my country. 
Thanks so very much for helping me in any way possible. I am forever grateful to you.