Lodge, Griswold, and an old LEE if you can find one are all well made DOs, you can even find a decent one from tex sport or any of those other cheaper off brands if you know what your lookn for, main thing with buying a cheaper oven is to make sure you get one with even thickness in the casting on the sides and an ovenr with a lid that closes nicley and snug, no rocking from it being uneven, Lodge casts their ovens and then grinds them to fit, as far as care and cooking in one, treat it as you would your grandmas old skillet, and no need to go buy do cookbooks, if you can cook it at home, you can cook it in a DO!
The wife and I have taught DO cooking seminars for over 20 years to numerous Boy Scout leaders in the states and in canada, we tell them the best thing you can do for your DO the first couple times you cook in them is to deep fry, specially donut holes or hush puppies etc. helps penetrate that oil into them, and then open up your cookbooks at home and experiment, have fun with them! cook at home in it for awhile and get used to using it, pretty darn simple. hope this helps, Beav