Haha yeah I had a look at those ones you suggested, look fine (as long as you dont drink too much!). Even a cheaper bottle of manzanilla or fino in Spain should be the Good Stuff, right? But ive been avoiding the cheapest stuff for a while tbh, too easy to knock back and Ive tried too many tasty others recently.
However, I have over the past year done some nerdy sampling and... research. Maybe useful and of interest for the Spain urbs!!
For well-priced options which are commonly available but still decent quality though, on top of the famous ones like Tio Pepe and La Ina:
La Guita 5e (Mercadona has it)
La Gitana 5e
Barbadillo Solear 5-6e
Williams and Humburt La Alegria Manzanilla 5e (harder to get but top stuff)
Williams and Humburt Fino Pando Muy Seco (green bottle) 5-6e (harder to get)
Osborne Fino Quinta 6e (from El Puerto but now made by Gonzalez Byass apparently)
Tio Nico in Lidl (total cheapo - less than 3 euros but actually decent! Great for cooking if you disagree. Might be made by W&H)
Williams and Humburt Don Zoilo Classic range is like 8-9e for amontillados and olorosos.
Gonzalez Byass Viña AB amontillado and Alfonso Oloroso are like 7-9e and excellent quality for the price.
La Bailaora Manzanilla and some other cheaper sherries from Real Tresoro (owned by Estevez group which also owns Guita and Inocente) in Mercadona. 2.50 - 6e
Similar cheaper range in Corte Ingles and Supercor for 2.50-6e too, also made by Estevez (not clear on the bottle but I checked - could even be same stuff as Mercadona's marca blanca)
Al Campo also does a cheaper range from 3-7e made as a budget version under name Herederos de La Gitana. Never tried but they do seem to be made by La Gitana in Sanlúcar.
NPU amontillado and Regente Palo cortado by Sánchez Romate are both sold in Corte Ingles and elsewhere but are excellent value for money if you wanna splash out. 15-18e but should last a month or more.
Tienda Gourmet in bigger Corte Ingles sell basic range Fenando de Castilla Fino and Manzanilla for 9e too and Tio Pepe en Rama for 15e a big bottle. (!!)
If you like sweet sherry and PX there is a good range of very good stuff in Corte Ingles for like 6-12e including Valdespino, Sánchez Romate and Spinola PX.
Bigger Carrefours sometimes sell La Gitana Manzanilla Pasada for like 12e a bottle I think. Expensive for Spain I guess!