Here is a good site to look up insulators. https://www.allinsulators.com The two F.M. Locke insulators are worth between $10 to $15.
The two Fred Locke ponies are pretty old for porcelain, probably around 1900-1904. Lots more info about Fred Locke (and other porcelain) here: http://www.r-infinity.com I'd agree with the price shotdown gave you.
The glass one is probably made by Brookfield for General Electric. The book price is 5-10, but it looks like yours has some haziness on the glass surface that might bring down the value a bit.