If you're devoted to your Demonias and can't imagine life without that extra four inches of height, don't despair. I'm sure most of us have a pair of platform heels for evening tucked in the backs of our closets, but there are plenty of chunky shoes available if your day job prefers you don't dress like a domina. ;-) (FYI: there's nothing wrong with that.)
Shoes like this are generally cheaper than boots - they're also not as stifling for your feet and lower legs, and easier to walk about in than heels. Try Demonia or Sella for this sort of style.
Probably the cheapest and most widely available option for Goths on a budget, and possibly also the most parent-friendly option for younger Goths. Of course, many Goth footwear brands have produced their own ranges of ballet pumps for the darkly inclined, but you can also pick up simple styles suitable for a Goth wardrobe from most shops on your local high street. Black glitter, studded, spiked, lacy, pointed or with bows are ALL styles I've seen everywhere from ShoeZone and Peacocks to Topshop and River Island, so there's something available for every taste and budget.
If you've got your heart set on a more specifically Gothy style, you can get bat buckles, skulls,
even bullets! My favourite pair of flats, however, are handmade by Em and Sprout on Etsy, and look like this:
Creepers, aka brothel creepers, have of course become majorly trendy of late. But they were popular in the Goth, punk and rockabilly subcultures long before they became co-opted by the mainstream, and are now available pretty much everywhere. (Although I'd rather not buy mine from Urban Outfitters... just on principle.)
Underground England do a variety of styles of creeper, including ones with wedge heels or a triple-stacked platform. There's also a sizeable range at Dark Kitten.
Tea Party Shoes
The whimsically-named tea party shoe is predominantly a Lolita accessory, but since these delicate, highly decorated styles are also available in black, make ideal summer wear for the fashion-conscious girly-Goth. Of course, depending on your style, you could mix it up with white, pink or red tea party shoes instead.
Clobbaonline, but a variety of designs are available from Qutieland. It's also worth trying eBay.
Shoes and Evening Wear
If you're out and about in the evenings, fear not. There are dozens, if not hundreds, of pairs of shoe that are suitable for the Goth club without reducing your feet to red, sweaty stumps. Something like the below picture would be suitable for day or evening.
heeled shoes that would be great for elegant daytime wear or an evening soiree.