Some Walmart stores have Anker's Zolo Mojo Smart Speaker with Google Assistant on clearance for as low as $15.
It's a great alternative to the Google Home Mini. Audio quality is definitely better than the Mini. Here are a couple of reviews:
I've purchased a couple at Walmart #2177 (ZIP code 92123) in San Diego for $20. Upon further inspection via Brickseek at other Southern California Walmart locations, there are some Walmart stores that have it as low as $15.
Walmart Supercenter #5193 Moreno Valley (ZIP code 92555): $15
Walmart Supercenter #1899 Riverside (ZIP code 92507): $15