Yes, parts for E23 are available but are deminishing by the days. Bomin is no longer ordering any parts for this car. What ever they have in stock once sold will not be replenished, unless you order it thru them. Same apply to First Division which have more stock for older model like E21, E23, E24 and E28. If the parts is available in their store, you can still buy them at old stock price. They do replenish the hot selling items like absorber mounting, oil filter etc. However, the new stock's price will goes up a lot since the Euro went up.
Just for info, the going rate for a E21 front absorber mount is now RM390/each. This is original BMW parts because BMW Mobile Tradition still sell parts for older BMW. Therefore, if you can't find a part because no one has stock, you can go to Auto Bavarian and ask them to order the part for you (at a premium of course).
Yeah, I do agree that it is sad to see some old E23/E24 lying outside some of the panel beater because the owner gave up in fixing them!