The most reasonably priced of the bunch are figurines alone and the most expensive seem to be the banks, which can fetch a pretty hefty price.
I have the Spaniel below and paid around $10 for it several years ago. Since then the popularity has grown for cast iron figures and I would expect to pay more for it now, maybe $20.00 or more.
Spaniel Figurine, image via Jewels of Yesteryear
image via Victorian Casino Antiques
This particular pig is a cigar cutter! I'm not quite sure how it works, but I think that tail plays a part. (Perhaps the cigar goes in the snout of the pig and the tail is a lever to cut it?)
Snail Boot Jack, image via Skinner Auctioneers and Appraisers
Owl Andirons, image via estateroadshow
Swan Ashtray, image via Factory 20
image via Rubylane
A collector would like the way this bear bank has most of it's original paint and that would certainly add to it's value. I however, prefer them without paint and like the aged patina of the iron.
Dachshund Boot Scraper, image via Aileen Minor
Image via Z & k Antiques
This mechanical frog bank would be a coup for a collector or dealer, and comes with a pretty hefty price.
Turtle String Holder, image via anythinggoeshere
Turtle Hotel Bell, image via Ruby Lane
images via Paul Madden's Antiques Gallery
I love this crab! (Wish it was in the budget)
To read about the history of cast iron toys: Antique Antiques
To read about collectible animal figures: lovetoknow antiques
To read an informative review by Jay Kerch, Owner of an antique gallery in Vermont: eBay Guide
These smaller cast iron figurines are just a small part of what's out there for cast iron antiques. Expect to find them occasionally in the behind glass cases of a thrift store. You can also find them at estate sales or auctions. Otherwise, look to eBay where you can expect to pay much more and most expensively at an antique store.
My apologies for not posting for awhile, I've had much going on and will try to not have such lapses in between posts.