If you need a more reliable experience, the Google TV Streamer (4K) or the newer Chromecast with Google TV (HD) are current-generation alternatives with full app support and modern processors. Google Chromecast 1st Generation Media Streamers - eBay
: eBay is the most reliable source for this specific model (H2G2-42). You can find pre-owned, open-box, and occasionally brand-new "sealed" units from various individual sellers.
You can still find this specific model through secondary marketplaces and specialty refurbishers: Where to Buy