So, I am tired of going to visit my mother for a month in summer and month in winter with no bike to ride. Would like to buy a bike that "lives" at her house. What I have: 50cm, frame no brand, painted red. Ultegra group, compact, Sora shifters, Cable Creek breaks. Carbon seat post and carbon fork GW. A friend built the bike for me. Would like something similar that I can have shipped to California. I have a teacher salary paid in pesos budget of $500. Any clues where I might shop for such a thing?