Tropical bulbs are an indulgance of mine.I have never kept a bulb over winter with any success.
I Buy thru a co-op and get them at reasonable prices.
Caladiums4Less has a sale on caladiums it's not a co-op perse just watch for his classifieds. I buy by the bag,as I believe you have to.
I tried wintering over the first year I bought bulbs from Bill.By the time they failed to sprout (in june) it was too late to order from him.
Cheap bulbs from Wallyworld,Home Depot,Lowes ets are just that,cheap.
Its the old addage"you get whet you pay for"
All gardeners learn this the hard way.I am first on the list.