Amazon has the 24-Ct Miracle-Gro Indoor Plant Food Spikes (NPK 6-12-6) for $1.44 with free shipping on $25+ or with Prime. Safe to use indoors; these spikes feed continuously for up to 2 months.
$1.44 retail: $8.68Report
Amazon has the Miracle-Gro Houseplant Potting Mix (4qt, 72574500) for $4.49 with free shipping on $25+ or with Prime. Home Depot has it for the same price with free shipping. Sells for $9+ elsewhere. Designed to be less prone to gnats.
$4.49 retail: $12Report
Amazon has the Miracle-Gro Garden Feeder with 1-lb Miracle-Gro All Purpose Plant Food (1004102) for $5 with free shipping on $25+ or with Prime. Has three spray patterns: shower, jet, and stream.
$5 retail: $13Report