Almost everything I drink is less than $50. I buy most of my wine from small shops and online so not sure if any of these will be at Specs or HEB (except for the USA stuff--I know Specs carries some of the producers listed below), but if you like hunting down wines with good value here's my list of my favorite producers by country/AOC/region:
France: Most of what I drink is from France. I steer clear of Bordeaux and Burgundy for the most part simply because they are so expensive and I've been priced out. Most of what I drink is from the Loire Valley and Cru Beaujolais (I'm partial to the villages of Morgon, Fleurie, and Moulin--Vent)
Loire:
CAB FRANC: Catherine et Pierre Breton, Chateau Yvonne, Olivier Cousin, Olga Ruffault (The newer vintages are around $25-$30 and I know it's not in the spirit of this post but if you can find old Ruffault--buy it. It probably wont be very expensive considering its age [<$100]. This is one of the benchmarks that shows what some bottle age can do to Cab Franc. I'm fond of the '79, '89 and '02.), Domaine Filliatreau, Domaine Guiberteau, Clos Roche Blance (sadly, 2014 was their last vintage) //
CHENIN BLANC: Frantz Saumon, Agnes et Rene Mosse, Richard Leroy (this is getting more and more expensive and might now be out of the $50 range), Domaine Huet (Sec and Demi-Sec Vouvray), Thibaud Boudignon, Nicolas Joly, Domaine Guiberteau, Francois Pinon, Pascal Potaire (CB Pet-Nat), Domaine de la Taille Aux Loups //
MUSCADET: Domaine de la Pepiere, Domaine de L'ecu, Domaine Pierre Luneau-Papin
OTHER LOIRE: Domaine Phillipe Tessier (Cheverny AOC), Christian Venier (Cheverny AOC), Clos du Tue-Boeuf (Cheverny and Touraine AOCs)
Beaujolais: Yann Bertrand (Fleurie and Morgon AOCs), Jean Foillard (Fleurie and Morgon AOCs), Marcel Lapierre (Morgon AOC), Domaine Dupeuble (Beaujolais AOC), Jean-Paul Thevenet (Morgon AOC), Daniel Bouland (Chiroubles and Morgon AOCs), Jean-Paul Brun, Yvon Metras (Fleurie AOC)
Jura: Benedict & Stephane Tissot, Phillipe Bornard, Domaine de la Pinte, Jacques Puffeney (sadly no longer producing, I believe 2014 was his last vintage)
Savoie: Domaine Belluard (some of his wines are getting up in $$$ but his sparkling Gringet is still cheap [<$25 and a great value]), Domaine Dupasquier, Patrick Bottex, Domaine des Ardoisieres, Jean-Yves Peron
Northern Rhone: Domaine Faury (St. Joseph AOC), Alain Graillot (Crozes-Hermitage AOC -- This is one of the best buys for your money IMO. Just a really well-made bottle of wine. Approachable young, but also fabulous with some age on it).
Italy:
Sicily: COS, Tami, Frank Cornelissen, Ariana Occhipinti (her Frappato is excellent but buy now if you see it--I bet this will be out of the $50 range soon)
Piedmont: G.D. Vajra (the Langhe Nebbiolo and Langhe Rosso), Roagna (Langhe Nebbiolo and Dolcetto D'Alba)
Emilia-Romagna: Denavolo (if you are in to skin-contact (orange) white wine then this will be up your alley)
Latium: Monastero Suore Cistercensi (Made by Cistercian nuns under the supervision of Paulo and Giampiero Bea--also an orange wine)
Trentino-Alto Adige: Foradori (Teroldego)
USA:
California: Broc Cellars(Red blend, Cab Franc), Folk Machine (Pinot), Birichino (Chenin), Lieu Dit (Cab Franc and Chenin), Stolpman (La Cuadrilla red blend), Arnot-Roberts (Trousseau), Matthiasson (Chardonnay), Scholium Project (some of their wines are $$$ but there are quite a few that are under $50), Lioco (Indica red blend)
Oregon: Fausse Piste (Garde Manger red blend is a good value at <$30), Teutonic (Rose and Pinot)