Ebay's your friend with both of these. For orks in particular, keep an eye out for stuff from the 5th ed starter set – it's a good way of boosting your boyz numbers without dropping loads of cash. The poses are less varied and dynamic than the multi-part boyz, but with some judicious application of minor conversions, using the spare bits from the boys kits, and mixing them in units with the muilti-part boyz, they do a perfectly good job.
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Here's a mob of Goff boyz where I did exactly what I just mentioned. That boss in the background is an
AoBR body and head with the big choppa arms left over from the Nobz kit. I'd say the easiest, quickest and most effective things to change about the
AoBR boyz are the angles of the choppa arms and heads; just requires a bit of cutting, pinning and greenstuff.