ZBT are fairly flexible in terms of MOQ and the 100 I've found is not set in rock.
I've made initial contact through Alibaba and ordered a couple of sample units to test initially and then placed an order of 20 each for two models which they were happy to deliver.
Yes, they are very nice for mesh nodes.
The MediaTek ones live in sweet harmony with the Atheros ones in a couple of our meshes. We use 802.11s as the 'connection' and run Batman-adv on top of that for the routing algorithm all managed centrally with a cloud controller.
Bought recently a TP-LINK TL-WR842ND.
Plenty of Flash and RAM, perfect if only using 2.4Ghz and ADSL (like 99% of the "normal" population ?).
Around 30 EUR.
LEDE could be flashed on it straight from the original firmware web interface.
I'm using Xiaomi MiWiFi Nano (also called Youth Edition, model number R1CL) in a few places. It's got 64MB RAM and 16MB flash, though Lede/OpenWRT can only use 8MB flash. It can be powered off USB, so I'm using one as a wireless bridge for an IPTV box, where it's powered directly from the (useless) USB port on the box. Costs $13-15 with shipping from AliExpress.
If you are like me and don't want those cheap chinese routers, I like TP-LINK TL-WR842N/ND v3, for 20 EUR you get 16MB flash, 64MB ram and USB port. Only 100mbit switch though. I'm still using a lot wr841n with 32MB/4MB, because they are even cheaper and power efficient (less than 2 watts), but hnyman is right, it is getting harder and harder to fit to 4MB. I like also WR1043ND, they have been supported on openwrt from the year 0, but they are quite expensive compared to chinese.
Here is the UK, my vote is the BT HomeHubV5A. 500Mhz 128/128MB, 4xGb ports, 2.4 & 5Ghz radios and VDSL2 modem. Ebay is flooded with them, so easy to get at around GBP10!
I bought one as I needed a small Gb switch and I fancied trying LEDE and my first experimenting with open source router firmware and haven't looked back. I've since bought a WRT1900ACS as a main router since it had a LEDE image available.
AC1200 Dual Band WiFi Router with Four High-Power Antennas , QoS , WPS Button
Main Chip MT7621A/Dual core/880Mhz
2.4G Chip MT7603EN
5G Chip MT7612EN
RAM DDR3 512MB (Max support 512MB)
FLASH SPI 16MB (Max support 32MB)
110/100M/1000M WAN Port,support auto reverse(Auto MDI/MDIX)
410/100M/1000M LAN Port,support auto reverse(Auto MDI/MDIX)
1USB 2.0 Port
1PCIE Port(Built-in)
1*SD Port
Recently I bought some PogoPlug Mobile and flashed OpenWRT on it... It's works very well so far.
CPU: Marvell 800mhz
FLASH: 128MB
RAM 128MB
very small case 10cmx11cmx4cm
low power consumption, it comes with 12v 1A power source
SD slot
1 direct? USB 2.0
dual status led (green-red)
1 ethernet gigabit
"eject" button (inner, as for "reset")
Price: bougt mine for 9 USD on Amazon some months ago, but I saw 2x listing at 14,98 USD now.
It has no Wifi but depending on your needs you could easily add a USB WiFi dongle and upgrade as needed, cheap 7 USD 2.4ghz USB WiFidongle or a much better one with dual band 2.4 and 5ghz for less than 20 USD and it usually comes with a detachable-replaceable external antenna.
There is other PogoPlug that has SATA and 2 USB 3.0, with internal USB hub, but only one of them works at 3.0 speed the other works at 2.0 as read on some website, same specs, and another one but with different case has internal power supply (with external power cable), and it has 3 USB 2.0 on the back and 1 USB 2.0 on the front (internal USB Hub) the later one is also very cheap...almost same price.
It is interesing to use as a OpenWrt NAS, that will my first experiment, and later I want to test the cryptographic support of the Marvell to see if speed up OpenVPN or WPA2-AES in some way...