Below are budget / low‑impact places near Yala National Park that advertise eco or low‑impact practices, with approximate starting rates and a source so you can check current availability and exact prices.

Top cheapest eco-minded options near Yala

• Yala Ying Yang Hostel & Camping — hostel + camping (near Palatupana). Very low nightly rates (Booking shows about NZD 39/night on sample dates). Good budget camping option with simple eco/low‑impact setup. (booking.com)
• La Safari Inn (Tissamaharama) — basic guesthouse popular with budget travelers; Trivago/booking listings show rates from roughly $15–$25/night on sample dates (fan rooms / dorm-style options available). Good cheap base for Yala safaris. (trivago.com)
• Funky Leopard Safari Lodge — budget lodge bordering Yala that promotes low‑impact amenities and affordable chalet/dorm options; Booking shows sample rates from about $40–$60/night. Often includes safari arrangements. (booking.com)
• Big Game Yala (by Eco Team) — glamping/camps run by the Eco Team group (brands itself as low‑impact/tented safari camps); Booking lists glamping options from roughly $45–$65/night depending on dates. (booking.com)
• Yala Village / Yala Village Eco Tree House (Tissamaharama) — small eco‑style tree‑house lodging on Booking with sample rates from about $40–$50/night. Good mid‑budget eco option close to the park. (booking.com)
• Yala Green Eco Lodge (Kirinda) — marketed as an “eco lodge” on Booking with sample rates from around $40/night; located in the Yala/Kirinda area and offers basic eco-minded facilities. (booking.com)
• Humbhaha / Humbhaha Wild Retreat — small eco retreat (treehouses, eco‑cabanas) near Yala that advertises solar/rainwater and local conservation practices; sample rates on the property site start higher (often $100+ depending on room), but it’s explicitly eco‑focused. (safariyalahumbhaha.com)

Quick notes and booking tips

• Prices vary a lot by season, room type and date — the sample rates above come from the cited listings and can change; always check the property page or Booking/Agoda for up‑to‑date rates. (booking.com)
• For the absolute cheapest stays, look at hostels, camping/glamping and guesthouses in Tissamaharama (the nearby town) rather than properties right on the park boundary. Several budget properties there are 10–30 minutes’ drive to Yala. (yalalk.com)
• If “eco‑friendly” is essential, check each property’s sustainability claims (solar power, water‑saving, waste recycling, community benefits) on the property website or in reviews before booking — many small budget places use some eco practices but aren’t formally certified. (safariyalahumbhaha.com)

If you want, I can:

• check availability and cheapest dates for any of these properties for specific travel dates, or
• pull a short list filtered by exact budget (e.g., under $40/night) and distance to the main Yala entrances.