Whilst the Rightmove and Zoopla rule the roost when it comes to domestic property for sale searches,  the commercial property sales marketplace is much more fragmented however. If you are looking for market opportunities you will need to have a good look around various websites and nor North Wales, the following list is going to be of value.

Right Move

A good list of commercial properties and probably the best starting point.

https://www.rightmove.co.uk/commercial-property-for-sale/North-Wales.html

Prime Location

An aggregation site that seems to be gaining some traction in North Wales, with links to various direct agents.

https://www.primelocation.com/for-sale/commercial/property/north-wales/ 

Zoopla

As per Right Move above, quite a good list

https://www.zoopla.co.uk/for-sale/commercial/property/north-wales/

St Davids Commercial

Very strong in the county of Conwy, well established and knowledgeable commercial agent

http://www.stdavidsproperty.com/

On the Market

Another Aggregator

https://www.onthemarket.com/for-sale/commercial-property/north-wales/  

Businesses for Sale

Property and Going Concerns

https://uk.businessesforsale.com/uk/search/commercial-property-for-sale-in-north-wales

Well established local agent, based in Gwynedd but with an increasing influence points East, including Conwy County.

https://www.dafyddhardy.co.uk/commercial.htm

BA Commercial 

Well established and now incorporating Gareth Williams Estates. Chester and St. Asaph based.

https://www.bacommercial.com/

Legat Owen

https://www.legatowen.co.uk/

Richard Baddeley

http://www.richardbaddeley.co.uk

Wyn Davies

https://www.wynnedaviesestateagents.co.uk/search-results/simple-listing-list-view/commercial/

Pebble Hill

http://www.pebblehill.co.uk/

Bolton Birch

https://www.boltonbirch.com/

Carter Jones

https://www.carterjonas.co.uk/commercial-property/to-rent/beddgelert-gwynedd/20009753

Mostyn Estates

A well diversified estate centred in Llandudno and Mostyn. The estate owns most of Llandudno, much is out on long leasehold agreements, but a proactive interest is taken in the health of the high street and buying back leases strategically.

https://www.mostynestates.co.uk/

16 Trinity Square

A portfolio of 20 offices in the centre of Llandudno

http://www.16trinity.co.uk

Full list 

Serviced Offices in North Wales Guide List