This is getting a bit silly... in a good way. In November, Fate/hollow ataraxia's corrupted Saber Alter will be joining her Fate/Zero and Fate/EXTRA sisters as a 1/10 scale Wave Beach Queen figure.
The figure is currently available for pre-order, priced at ¥3,800 ($47.75)
Beach Queen Fate/zero Saber
Beach Queen Fate/EXTRA Saber
The Fate/stay night visual novel offered a "Heaven's Feel" route, in which the Saber we know from conventional Fate/stay night and prequel Fate/zero is corrupted by Angra Mainyu, and becomes the servant of the route's heroine, Sakura Matou. The version of the character shows up in the sometimes goofier seque/fan disc Fate/hollow ataraxia.
There's also Fate/EXTRA's "Red Saber" a playable alternate universe game character. Unlike Saber/Saber Alter, she's not King Arthur. This one proves to be the Roman Emperor Nero.
There's also Takashi Takeuchi's "girlie" alternate version, Saber Lily, who is probably in line for a Beach Queen figure at some point. This Princess of Knights wields Caliburn rather than Excalibur. She's based on how Fate/stay night's Caster (Medea) dresses her while she's captured in Unlimited Blade Works. Nasu Kinoko and Gen Urobuchi have gone on to say that she's what would happen if Caster tamed Saber.
And, for the sake of completeness, there's also Fate/tiger colosseum's Saber Lion.