The lowest I see on SlickDeals (in the past 6 months) for new units is $120 for the 56U and $150 for the 58U -- both in USD.I don't think you'll get lower performance for yours N and AC clients.
As far as I remember, the AX56U was always the cheapest Wi-Fi 6 model with Merlin support - I bought it for less than $100 equivalent (regular price, I see the AX58U at a price of around $110 equivalent). However, prices in your country may be different.
From Asus:
56U
WiFi 4 (802.11n) : up to 433 Mbps
WiFi 5 (802.11ac) : up to 867 Mbps
58U
WiFi 4 (802.11n) : up to 300 Mbps
WiFi 5 (802.11ac) (1024QAM) : up to 1733 Mbps
Doesn't the above value cut in half if the client doesn't support 1024QAM?
68U
WiFi 4 (802.11n) : up to 450 Mbps
WiFi 5 (802.11ac) : up to 1625 Mbps
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