Most tourists to Tachilek pop across the border from Thailand for a night and there are many hotels in town. Prices are usually quoted in Baht but dollars are welcome.
Budget
$
Dream Flower Hotel
+95 84 51318, + 66 814737904
Recently renovated, the hotel is nice, neat, quiet and tidy, albeit in a concrete building.
Top end
$$$
Allure resort and casino
Baydar Street, Tachilek
3000-30000 baht
Luxury hotel and casino aimed at a Thai clientele.