Hi
I have lived in Spain for a few years. There is a huge variety in regards to shops but I can tell you good quality high end furniture costs a fortune in comparison to the UK. Shipping from the UK is expensive but is only worth it depending on what you want to buy. I shipped over a bespoke kitchen island unit as this was far cheaper to buy in the UK. I used the website Shipley and it cost 250 and was delivered in the week straight to my door and was a two man job.
I shipped over a inflatable spa which weighed 40kg with royal mail parcel force and it took 48 hours and cost 38.
Oak furniture land in the UK will ship orders to Spain.The more you buy the better cost of shipping. Same with DFS but they now have a store in San Javier.
IKEA you can order online a lot of products and they will deliver for approx 55 euros. You can get sofas and beds for a good price. Use Google translate. There are also companies who will collect your furniture but they charge a small fortune.
Laura Ashley - Spain, their closest store is Barcelona but they are online. Costs vary as depends on what you buy. The furniture costs way more than in the UK so wait for their online sale.
Westwing - this is a Spanish online store. It's basically the Spanish version of Achica in the UK. They do high end stuff at a discount price, you can get great deals on here. They will deliver. Use Google translate.
San Javier has some good shops offering budget to higher end pieces so they have something for everyone. Bear in mind that Spain does have sales like UK shops or bargain with them for a discount, Spaniards do not mind this at all. They will deliver for a fee or for free if you buy a lot or again bargain with them.
Nauru Garden Centre Mazarron - has some nice bits of shabby chic furniture and garden furniture. They are expensive but do have sales. Will deliver for free.
Le Roy Merlin- I got a kitchen from them and they will deliver for a fee or you can pick up your order. This store is like B and Q. They employ staff that speak English if you need it. You can also order some products online. Also they do good sales at times.
You can get furniture packs from a lot of retailers in Spain. These are not my thing so can't comment on these but you will find plenty.