Price comparison time!
Isis Books 7-day candles: $15
SoM 7-day candles: $5.90 - 8.45 (on sale from $6.95 - 9.95)
Isis Books small Thoth deck: $20
SoM small Thoth deck: $17 (on sale from $20)
Isis Books brass Celtic Cauldron: $30
SoM brass Celtic Cauldron: $22.05 (on sale from $25.95)
Some prices are equal, but even without the sale most SoM prices I looked at are better. And with the sale it's no contest.
Isis Books is for all your Not-Currently-Sold-Here supplies, really.